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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Undocumented change in binding of buffer-local variables?
Date: Fri, 12 Jul 2002 11:37:54 -0600 (MDT)
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    I found a bug in ielm which I can easily fix and for which I will send
    a report and patch soon.  However, the best solution depends on
    whether or not it is now safe to exit a let-form, binding buffer-local
    variables, with a changed current buffer.

I suggest you play it safe anyway.